HomeMy WebLinkAboutFOSSIL LAKE FOURTH FILING, FIRST REPLAT - PDP - 33-01Q - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTNorth Star
Iamawdesign, inc.
July 11, 2007
Basil Hamdan
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, CO 80524
RE: Drainage Letter for Fossil Lake P•U.D., Seventh Filing
Basil,
This letter is intended to update the drainage information that was presented in "Final
Drainage & Erosion Control Report for Fossil Lake P.U.D., Fourth Filing" by North Star
Design, Inc. dated December 10, 2003. Fossil Lake P.U.D., Seventh Filing is a replat of
the Fourth Filing although the general layout has been maintained. The general drainage
patterns proposed with the Fourth Filing have also been maintained with the following
revisions:
1) Basin 4 has been divided into Basins 4, 4A and 4B.
2) Minor reconfigurations of Storm 1 and Storm 3 have been proposed.
3) Basin 5 flows to Shallow Pond Drive and an inlet was eliminated.
Attached are the revised runoff calculations, the revised pond calculations and the revised
storm calculations. The 100 year c-value increased slightly from 0.81 to 0.83. The
amount of detention required was reduced slightly but the 100 year high water elevation
was maintained. In general, the proposed changes have a very minor affect on the
drainage and detention system.
Please call if you have questigns or comments.
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Patricia oetch, P
JONAL , , •• ,
700 Automation Drive, Unit I Windsor, Colorado 80550
970-686-6939 Phone 0 970-686-1 188 Fax